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O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2024 · Q401 Mark

An aqueous solution contains cations of metal X. A precipitate forms when a few drops of aqueous sodium hydroxide are added to the solution. The precipitate dissolves in excess aqueous sodium hydroxide. What is a possible identity of metal X?

Aaluminium: ✓, ammonium: x, zinc: ✓
Baluminium: ✓, ammonium: ✓, zinc: x
Caluminium: x, ammonium: x, zinc: ✓
Daluminium: x, ammonium: ✓, zinc: x

✓ Correct answer

A: aluminium: ✓, ammonium: x, zinc: ✓

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About this question

Topic
Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2024 Paper 1 Variant 1, question 40.

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